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I think I am back to the grief/denial stage.
The valve lash adjustment is nothing like on a vintage Ford Fiesta with a Ford-of-England pushrod motor or a British sports car -- i.e. feeler gauge to measure the clearance, turn the adjuster screw on the rocker arm.
The arrangement on the overhead cam engine involves shims. You need to measure the clearance, remove the existing shim with a special tool, measure the thickness of the shim with a micrometer, go to the Toyota dealer to get a factory approved shim of the required thickness to correct the clearance to spec . . .
The lash adjustment is supposed to be a "lifetime" affair with the shims instead of adjuster screws that can "back out"?
The linked article emphasized the carbon deposit theory and suggested either in-tank or in-the-brake-booster-vacuum line engine treatments.
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